focusing magnifier
/ˈflaɪfɪʃɪŋ ˈwɒn/
n
English · focusing magnifier中文 · 调焦放大镜Español · lupa de focalizaciónFrançais · loupe de mise au point
Bedeutung：Instrument that causes the image projected on the baseboard to be magnified and make it easier to focus.